A case of giant hydronephrosis leading to obstructive jaundice due to primary obstructive megaureter in an adult is the subject of this presentation. Giant hydronephrosis due to primary obstructive megaureter in adults is uncommon. This is also the first case of obstructive jaundice due to primary obstructive megaureter reported in the literature. The patient was initially treated with a percutaneous nephrostomy till the jaundice resolved. This was followed by definitive surgery in the form of ureteral tailoring and reimplantation along with nephroplication and nephropexy, with a successful outcome.